package com.heimali.happyreader.utils;

public class UserUtils {
	public static final int USERNAME_OK = 100;
	public static final int USERNAME_HAD_USED = 101;
	public static final int USERNAME_NOT_EMAIL = 102;
	
	
	public static final int PASSWORD_OK = 200;
	public static final int PASSWORD_TOO_SHORT = 201;
	public static final int PASSWORD_TOO_LONG = 202;
	
	public static final int USERNAME_OR_PASSWORD_ERROR = 301;
	
	public static int checkUserName(String username) {
		username = username.trim();
		if(username.indexOf("@") <= 0) {
			return USERNAME_NOT_EMAIL;
		}
		
		return USERNAME_OK;
	}
	
	public static int checkPassword(String password){
		int len = password.length();
		if (len < 6) {
			return PASSWORD_TOO_SHORT;
		}else if (len > 20) {
			return PASSWORD_TOO_LONG;
		}
		
		return PASSWORD_OK;
	}
	
	public static String getUserName(String username, String password) {
		return lie(username, password);
	}
	
	public static String getPassword(String password, String username) {
		return lie(password, username);
	}
	
	private static String lie(String src, String key) {
		int seed = key.length();
		char[] chars = src.toCharArray();
		for(int len=chars.length,i=0;i<len;i++) {
			chars[i] = (char)((int)chars[i] + i + seed*(i%2==1 ? 1 : -1));
		}
		return StringUtils.escape(String.valueOf(chars));
	}
}
